ABSTRACT
Economic policy uncertainty (EPU) is an important driver of the correlation in the oil–stock nexus. However, whether the effect of EPU on oil–stock correlations across different market conditions is heterogeneous remains unclear. To fill this gap, we combine a dynamic conditional correlation with the mixed data sampling (DCC-MIDAS) model and the Markov regime-switching model to explore the market-state-dependent effects of EPU on oil–stock correlations under different regimes. Empirical results indicate that the impacts of EPU on oil–stock correlations are regime-dependent both at the aggregate and industry levels, with stronger effects in high-correlation regimes, and these effects are more significant in times of economic turmoil. Moreover, the impact of EPU on oil–stock correlations is larger during the COVID-19 pandemic than it was during the Global Financial Crisis. These findings highlight the need to consider the nonlinear impact of EPU under different market conditions.
ABSTRACT
This study extracted the demand preference topic words of new energy vehicle consumers with the help of the topic model, calculated the similarity between the word vectors and the topic keywords and expanded the topic keywords, analyzed and compared the demand topics and feature expansion words of different car models, and summarized the demand differences of other consumer groups. The analysis results show that consumers’ demands of different groups have the exact demand dimensions such as new energy features and brand features, and different demand dimensions such as application, services, and professional performance. The research findings help consumers filter valuable information from online review data and help car companies objectively and accurately obtain consumer demands, develop more reasonable marketing strategies, and achieve healthy and sustainable corporate development.
ABSTRACT
BACKGROUND: Increased risks have been found for patients undergoing liver transplantation due to the blood supply shortage following the ongoing coronavirus disease 2019 (COVID-19) pandemic. Hence, exploring a method to alleviate this dilemma is urgent. This phase I, nonrandomized, prospective trial aimed to evaluate the safety and feasibility of using donor-specific red blood cell transfusion (DRBCT) as an urgent measurement to alleviate the blood supply shortage in deceased donor liver transplantation (DDLT). METHODS: The outcomes of 26 patients who received DRBCT and 37 patients in the control group who only received 3rd party packed red blood cells (pRBCs) transfusion between May 2020 and January 2021 were compared. RESULTS: Patients receiving DRBCT did not develop transfusion-related complications, and the incidence of postoperative infection was similar to that in the control group (23.1% vs. 18.9%, P=0.688). Because the patients received the red blood cells from organ donors, the median volume of intraoperative allogeneic red blood cell transfusion from blood bank was 4.0 U (IQR 1.1-8.0 U) in the DRBCT group, which is significantly lower than that (7.5 U, IQR 4.0-10.0 U) in the control group (P=0.018). The peak aspartate aminotransferase (AST) level was significantly lower in the DRBCT group than in the control group (P=0.008) and so were the AST levels in the first two days after the operation (P=0.006 and P=0.033). CONCLUSIONS: DRBCT is a safe and effective procedure to lower the need for blood supply and is associated with a reduction in AST levels after transplantation. DRBCT is beneficial to patients receiving life-saving transplantation without sufficient blood supply during the COVID-19 pandemic.
ABSTRACT
Social impacts and serious damages caused by the COVID-19 pandemic have resulted in public introspection on the issue of ecological environmental protection. However, whether the public cognition of COVID-19 can promote pro-environmental behavioral intentions (PEBI) has not yet been determined; this is crucial for studying the ecological significance of the pandemic. Based on the affective events theory (AET), this study investigated the mechanism by which COVID-19 emergency cognition influences public PEBI. Following an analysis of 873 public questionnaires, the results reveal that public cognition of COVID-19 emergency can significantly promote PEBI. Among them, the effect of emergency coping is stronger than that of emergency relevance. Besides, the positive and negative environmental affective reactions aroused by COVID-19 pandemic play a mediating role between the emergency cognition and PEBI. Moreover, the positive environmental affective reactions show a stronger positive effect on household-sphere PEBI. However, the negative environmental affective reactions are more prominent in promoting public-sphere PEBI. This research aims to bridge a research gap by establishing a link between COVID-19 pandemic and PEBI. The findings can provide useful recommendations for policymakers to find the opportunity behind the COVID-19 emergency to promote public PEBI.